I did not like my results when I used modge podge, maybe it was because I was impatient and didn't wait long enough for it to dry before adding my resin but I was able to see the modge podge underneath. Be careful not to put too much resin on the bottle caps, it shouldn't be going down the sides, that doesn't look pretty when it dries even if you have it raised up so it won't be a giant glob. The bubbles form when you are mixing the et lite, try not to "whip" it to get extra air bubbles in. There will always be air bubbles just wait about five minutes after you have put the et lite on the bottle caps and the bubbles rise to the top, take a lighter and hold it over and they will pop. Sometimes I still have one or two bubbles I cant get, you can always use a toothpick if it hasn't been sitting too long.